Obese males between the ages of 14 and 20 reportedly have 50% less testosterone than their normal weight counterparts, which notably decreases their chances of being fertile when they are older. The study, published online in Clinical Endocrinology, was conducted by the same researchers, from the University at Buffalo's School of Medicine and Biomedical Sciences, who, in 2004, released a study regarding levels of low testosterone (hypogonadism) found in adult type 2 diabetic males. They verified their findings in 2010 with a trial involving over 2,000 diabetic and non-diabetic obese patients.